The influence of polymer–surfactant aggregates on drag reduction

Matras, Z.; Malcher, Tadeusz; Gzyl-Malcher, Barbara

doi:10.1016/j.tsf.2007.11.057

Cited by 39 publications

(52 citation statements)

References 23 publications

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“…Below the critical shear stress, we observe freely rotating micelles with no ordered orientation [2] (Bewersdorff 1986). The The DR of combination for two-phase liquids, dilute polymer and surfactant solutions-have been studied previously by numerous researchers [3][4][5][6][7][8][9][10] The presence of polymer with surfactant micelle-like aggregates begin to form at a critical aggregation concentration (cmc). Thus cmc is an analogue of cmc in solutions of surfactants with added polymeric component.…”

Section: Introductionmentioning

confidence: 99%

“…A characteristic feature of this parameter is that it is always lower than the cmc of the corresponding surfactant. Binding of surfactant to the polymer, which may depend on several parameters, such as charge density, surfactant structure, and ionic strength, can lead to the formation of characteristic micro-and macrostructure, [6] proposed a mechanism for surfactant-polymer drag reduction, he observed that an interaction between polymer and surfactant causes an aggregation.These structures responsible for drag reduction. In this work, an enclosed Rotating Disk apparatus (RDA) was used to study the drag reduction effectives of ionic polymer (polyacriamaide) and anionic surfactant (Sodium dodbenzensulfonate (SDBS)) individually and in combined form.…”

Section: Introductionmentioning

confidence: 99%

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Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Bari

Yousif

Yaacob³

et al. 2015

IJBAS

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This paper focuses on the determination of the interaction between polymer (Polyacrylamide (PAM)) and surfactant (Sodium dod benzene sulfonate (SDBS)) as a drag reducer using Rotating Disk apparatus (RDA) at various concentrations (500, 700, 1000, 1500 and 2000) ppm individually and in the combined form under turbulent conditions at different rotation speed up to 3000 rpm, as well as studying their mechanisms as a drag reducer. The results show that the maximum percent drag reduction increases to (40, 41, 43, 45 and 48)% by using the combined additives of surfactant and polymer at the above concentrations respectively, with slower degradation and display drag reduction for a larger range of Reynolds numbers. The nano and micro particles formed from the combined PAA and SDBSA was studied using cryo-transmission electron microscopy (cryo-TEM) techniques. The images show the surrounding of polymer chain to the surfactant micelle to form an aggregate structure. A hexagonal crystalline form was suggested to describe the shape of the aggregate structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Bari

Yousif

Yaacob³

et al. 2015

IJBAS

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“…The counter-ion acts as a reagent to reduce ionic radius of the surfactant, deforming micellar shape from globular to rod-like micelles (Kawaguchi et al, 1997;Li et al, 2008). These rod-like micelles entangle together to bind strongly to micelle surface and facilitate the formation of large semiflexible worm like aggregates, at very low concentration (around 1 mM), which form an entangled network structure (Rehage and Hoffmann, 1991;Matras et al, 2007). These rod-like or thread like micelles can align along the flow direction in a pipeline like polymer chains and are the cause of the drag reduction ability of surfactant solutions (Qi and Zakin, 2002;Qi et al, 2003).…”

Section: Other Reagentsmentioning

confidence: 99%

“…The economic efficiency of this process depends on the power requirements for pumping, which in turn depend on the concentration, viscosity, and yield stress of concentrated slurries (Horsely, 1982). Certain chemical additives enable the slurries to be pumped at much higher concentration of solids, thus reducing the energy consumption and water requirements, which is an important consideration in power stations in view of the reduced size of the ash ponds to accommodate the fly ash slurry (Biswas et al, 2000;Seshadri et al, 2005;Matras et al, 2007;Verma et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Influence of Chemical Reagents on Rheological Properties of Fly Ash-Water Slurry at Varying Temperature Environment

Naik¹,

Mishra²,

Rao³

2011

CCGP

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About 70% of total electrical energy is generated from thermal power plants in India which in turn release about 160 Mt of fly ash as solid waste annually. Transportation and disposal of such a huge amount of fly ash is a major problem faced by the power plants. Presently fly ash is transported as lean slurry in pipe lines requiring about 80 to 85% of water with high energy input. A major impediment in high volume transportation of fly ash is its high specific gravity as compared to that of water. The objective of the present study was to evaluate the rheological characteristics of high concentration fly ash slurry with and without a chemical reagent at varying temperature environment to facilitate smooth flow of materials in the pipelines. Six different composition of fly ash slurry samples were considered for investigation. The main constituents of the slurry were fly ash, water, a cationic surfactant, and a counter-ion. Detailed rheological properties were determined using a cylindrical coaxial rotational rheometer at shear rates varying from 25s 21 to 1000s 21 for 40% solid concentration (by weight). Temperature was varied from 20uC to 40uC for all the shear rates investigated. Test results showed that all the slurries exhibited shearthinning behaviour in the presence of the surfactant. The influence of cationic tenside on drag reduction of fly ash slurry was also studied. The distinctive reduction of surface tension on colloidal dispersion characteristics of the fly ash slurry was observed in the presence of the tenside. It revealed that the slurry developed in the above manner has a potential to be transported through pipelines with minimal energy consumption.

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“…The economic efficiency of this process depends on the power requirements for pumping, which in turn depend on the concentration, viscosity, and yield stress of concentrated slurries (Horsley, 1982). Certain additives enable the slurries to be pumped at much higher concentration of solids, thus reducing the water requirements, which is an important consideration in power plants to minimize the size of the ash pond area to accommodate the slurry (Seshadri et al, 2005;Verma et al, 2008;Biswas et al, 2000;Matras et al, 2007). Fly ash slurries consist largely of silica with varying amounts of other materials such as Al, Fe, and alkaline earth materials.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Drag-Reducing Additives on the Rheological Properties of Fly Ash-Water Suspensions at Varying Temperature Environment

Naik¹,

Mishra²,

Karanam³

2009

CCGP

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A B S T R A C TFly ash transportation and disposal is a major problem in India. Presently fly ash is being transported as lean slurry in pipe lines requiring about 80 to 85% of water which, in turn, consumes more energy input. The objective of the present study is to evaluate the rheological characteristics of fly ash slurry at varying temperatures with and without an additive to facilitate smooth flow in the pipelines. Six fly ash slurry samples were prepared from the fly ash obtained from a thermal power plant situated in the southern part of India. The main constituents of the slurry were fly ash, water, a cationic surfactant and a counter-ion. Detailed rheological properties were determined for the six slurries at shear rates varying from 25 to 500s 21 .Temperature was varied from 20uC to 40uC for all the shear rates investigated. The slurry exhibited Newtonian flow behaviour with zero yield stress. The slurry prepared in the above manner has a potential to be transported through pipelines with minimal energy consumption. The distinctive reduction of surface tension on colloidal disperse characteristics of the resulting slurry was observed in the presence of the surfactants. Zeta potential measurements also confirmed that the additive has the capability to keep the fly ash particles water borne during its transportation in pipelines.

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The influence of polymer–surfactant aggregates on drag reduction

Cited by 39 publications

References 23 publications

Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Effect of SDBS on the drag reduction characteristics of polyacrylamide in a rotating disk apparatus

Influence of Chemical Reagents on Rheological Properties of Fly Ash-Water Slurry at Varying Temperature Environment

The Effect of Drag-Reducing Additives on the Rheological Properties of Fly Ash-Water Suspensions at Varying Temperature Environment

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